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    Mobility Radeon HD 3870 X2 vs Radeon RX 640

    If you are going to buy a new graphics card and are choosing between Mobility Radeon HD 3870 X2 and Radeon RX 640, there are a couple of things to consider. Cards with more VRAM in general perform better and allow you to play on higher graphics settings. Size also makes a difference. A model with a large heatsink can occupy up to three expansion slots on a motherboard. Be sure you have enough room in your PC case. When comparing GPUs with different architectures, more processing cores and even higher TFLOPS will not always translate to better performance. To help you decide which GPU you need, we have measured frame rates in a number of popular games. For more on how the Mobility Radeon HD 3870 X2 stacks up against Radeon RX 640, check out specs charts below.
    Mobility Radeon HD 3870 X2 Check Price
    Radeon RX 640 Check Price

    Mobility Radeon HD 3870 X2 and Radeon RX 640 are Laptop Graphics Cards

    Note: Mobility Radeon HD 3870 X2 and Radeon RX 640 are only used in laptop graphics. They have lower GPU clock speed compared to the desktop variant, which results in lower power consumption, but also 10-30% lower gaming performance. Check available laptop models with Mobility Radeon HD 3870 X2 or Radeon RX 640 here:

    Mobility Radeon HD 3870 X2 Laptops
    Radeon RX 640 Laptops

    Main Specs

      Mobility Radeon HD 3870 X2 Radeon RX 640
    Power consumption (TDP) 110 Watt 50 Watt
    Interface PCIe 2.0 x16 PCIe 3.0 x8
    Supplementary power connectors None
    Memory type GDDR3 GDDR5
    Maximum RAM amount 512 MB 4 GB
    Display Connectors No outputs 1x DVI, 1x HDMI, 1x DisplayPort
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    • Mobility Radeon HD 3870 X2 has 120% more power consumption, than Radeon RX 640.
    • Mobility Radeon HD 3870 X2 is connected by PCIe 2.0 x16, and Radeon RX 640 uses PCIe 3.0 x8 interface.
    • Mobility Radeon HD 3870 X2 has 508 GB more memory, than Radeon RX 640.
    • Both cards are used in Laptops.
    • Mobility Radeon HD 3870 X2 is build with RV6xx architecture, and Radeon RX 640 - with Polaris.
    • Core clock speed of Radeon RX 640 is 558 MHz higher, than Mobility Radeon HD 3870 X2.
    • Mobility Radeon HD 3870 X2 is manufactured by 55 nm process technology, and Radeon RX 640 - by 14 nm process technology.
    • Memory clock speed of Radeon RX 640 is 5150 MHz higher, than Mobility Radeon HD 3870 X2.

    Game benchmarks

    high / 1080p 6−7 5−6
    ultra / 1080p 4−5 3−4
    QHD / 1440p 0−1 2−3
    low / 720p 16−18 16−18
    medium / 1080p 8−9 7−8
    The average gaming FPS of Mobility Radeon HD 3870 X2 in Assassin's Creed Odyssey is 12% more, than Radeon RX 640.

    Full Specs

      Mobility Radeon HD 3870 X2 Radeon RX 640
    Architecture RV6xx Polaris
    Code name M88-XT CF Polaris 12
    Type Laptop Laptop
    Release date 1 September 2008 12 August 2019
    Pipelines 640 640
    Core clock speed 660 MHz 1218 MHz
    Boost Clock 1218 MHz
    Transistor count 666 million 2,200 million
    Manufacturing process technology 55 nm 14 nm
    Texture fill rate 10.56 38.98
    Floating-point performance 2x 422.4 gflops
    Memory bus width 256 Bit 64 Bit
    Memory clock speed 850 MHz 6000 MHz
    Memory bandwidth 54.4 GB/s 112.0 GB/s
    Shared memory - -
    DirectX 10.1 (10_1) 12 (12_0)
    Shader Model 4.1 6.4
    OpenGL 3.3 4.6
    OpenCL N/A 2.0
    Vulkan N/A 1.2.131
    FreeSync +
    Laptop size large large
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